/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMesh3.h
enumerable object for boundary edge indices suitable for use with range-based for, ie for ( int i :BoundaryEdgeIndicesItr())
[FRefCountVector::FilteredEnumerable](API\Runtime\GeometryCore\Util\FRefCountVector\FilteredEnumerable) BoundaryEdgeIndicesItr() const